MRCOOL Signature Series 3.5 Ton R-454B Multi-Position Air Handler 208/230V MCAEAMPEF42C21AA
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The MRCOOL® Signature Series 42k Multi-Position Air Handler is built to provide consistent, energy-efficient comfort in any climate. Designed for flexibility and performance, this unit works with R-454B refrigerant, a low-GWP alternative that helps reduce environmental impact without sacrificing power or reliability.
Its multi-position design allows for installation in upflow, downflow, or horizontal configurations, making it ideal for a variety of home layouts. With its slim, space-saving profile, it fits easily into closets, attics, or crawl spaces while still delivering full-capacity heating and cooling when paired with a compatible condenser or heat pump.
Engineered for durability, the air handler includes a galvanized steel cabinet, a high-efficiency ECM blower motor, and copper coils with enhanced aluminum fins for superior heat transfer and humidity control. Thermal insulation inside the cabinet reduces energy loss and prevents condensation, contributing to quiet operation and lower energy bills.
Installation is fast and simple, helping to minimize labor time and disruption. An air filter rack allows for easy maintenance, while an optional electric heat kit is available for added heating performance in colder regions.
Smart home compatibility comes standard, with support for most third-party thermostats so you can manage comfort on your terms.
Protected by a 10-year limited parts warranty, the MRCOOL® Signature Series 42k Multi-Position Air Handler offers long-lasting performance, space-saving design, and year-round efficiency.
Technical Specifications
| Tonnage | 3.5 Ton |
| CFM | 1254 |
| Voltage | 208/230 V |
| Phase | 1 |
| Frequency | 60 Hz |
| Max Fuse/Breaker | 10 A |
| Min Circuit Ampacity | 7.2 A |
| Refrigerant Type | R-454B |
| Sound Level | 54 dBA |
| Liquid Line Size | 3/8" |
| Suction Line Size | 3/4" |
| Net Dimensions (D×H×W) | 22" × 45.75" × 19.625" |
| Net Weight | 131 lbs |
| Gross Dimensions (D×H×W) | 25.6" × 47.875" × 22.83" |
| Gross Weight | 144 lbs |
Certifications
- UL Listed
- CSA Listed
- ETL Listed
- AHRI Certified
Warranty
- 10 Year Parts Warranty
- Limited Lifetime Compressor Warranty
Product Documentation
- MRCOOL Signature Series Multi-Position Air Handler 3.5T Installation Manual (PDF)
- MRCOOL Signature Series Multi-Position Air Handler 3.5T Warranty Document (PDF)
- MRCOOL Signature Series Multi-Position Air Handler 3.5T Brochure (PDF)
WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.